A. Andreoni et al., Relevance of temporal coherence in the second-harmonic cross-correlation measurement of a multiply scattered laser pulse, EUR PHY J D, 8(1), 2000, pp. 111-116
Second-harmonic cross-correlation operates a selection in time-phase among
the randomly dephased contributions to an optical field that propagated thr
ough a scattering medium. It can thus be used to selectively detect the wea
k contribution remaining coherent with the incident field.